全国公共英语PETS2精品阅读53

As the air in the earth's atmosphere swirls around over our heads, the light passing through it from space to earth is continually bent in different directions. This causes a rippling effect, like when you observe something underwater, or look down a hot road in the summer. To our eyes, the stars appear to twinkle.
　　当大气中的空气在我们上方旋动，光线穿过大气层，从太空照射到地球，并且往不同方向折射，这样便形成了涟漪般的效应，这就好像你看着水底下的东西，或是在夏天里望着炙热的马路，道理是一样的。所以，在我们眼中，星星在闪烁。